The Cowon D2 is said to have a "fake" line-out when increasing to 49-50 volume. I've tried it when I owned the D2 but still a bit skeptical. I'd rather use the "true" line-out in the iPod. That's why I sold my D2 and grasped the Video.
I can hear big difference in the Video but almost nothing in the D2.
The 1st gen Shuffle has a very good internal amp, and many say that it'll sound worse when using amp.
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